This is a lesson I did for year 6's during transition week to help develop atlas skills and knowledge of places.
Pupils used the atlas to create a fact file on the country of their choice on the back of the balloon outline. They then drew the flag on the balloon.
Once complete they cut them out and hung them on a 'washing line&' in alphabetical order. This required them to look at the factfile to find out the country represented by each flag.